根据问句，选择适当的答语。(20分)
(  )（1）What are you going to do for Sports Day?
(  )（2）Where are you going?
(  )（3）What are you doing?
(  )（4）Good luck!

A．I'm running.	B．I'm going to run the 100 metres.
C．Thank you!	D．I'm going to run in the park.